Process and apparatus for interlacing strands

ABSTRACT

A process for the production of a multistrand yarn having a coherent structure by interlacing the strands thereof comprising subjecting the strands, while substantially parallel, to the action of a rapidly moving fluid delivered from at least two jets in a zone substantially parallel to the passage of the yarn, the two jets being in substantially parallel planes, but delivering the rapidly moving fluid in substantially opposite directions. The apparatus for the production of such multistrand yarn includes two plates or blocks having abutting surfaces, at least one of the abutting surfaces having recesses therein defining at least two straight or curved conduits for passage of a rapidly moving fluid in opposite directions, impinging a yarn traveling in a plane substantially parallel to the rapidly moving fluid.

United States Patent [191 Ohayon PROCESS AND APPARATUS FOR INTERLACING STRANDS [75] Inventor: Gabriel Ohayon, Lyons, France [73] Assignee: Societe Rhodiaceta, Paris, France [22] Filed: June 17, 1971 [21] Appl No.: 154,136

[ 1 Foreign Application Priority Data June 18, 1970 France ..7022405 [52] US. Cl ..28/l.4, 28/7212 [51] Int. Cl. ..D02g 1/16 [58] Field of Search ..28/1.4, 72.12

1 [56] References Cited UNITED STATES PATENTS 3,115,691 12/1963 Bunting et a]. ..28/1.4

3,448,501 6/1969 Buzano ....28/1 4 X 3,478,398 11/1969 Barlow et al. ..28/l.4

3,525,134 8/1970 Coon ..28/l.4 3,577,615 5/1971 Le Noir ..28/72.12

FOREIGN PATENTS OR APPLICATIONS 6,708,743 7/1968 Netherlands ..28/1 4 Primary Examiner-Louis K. Rimrodt Attorney-Sherman and Shalloway 5 7 ABSTRACT A process for the production of a multistrand yarn having a coherent structure by interlacing the strands thereof comprising subjecting the strands, while substantially parallel, to the action of a rapidly moving fluid delivered from at least two jets in a zone substantially parallel to the passage of the yarn, the two jets being in substantially parallel planes, but delivering the rapidly moving fluid in substantially opposite directions. The apparatus for the production of such multistrand yarn includes two plates or blocks having abutting surfaces, at least one of the abutting surfaces having recesses therein defining at least two straight or curved conduits for passage of a rapidly moving fluid in opposite directions, impinging a yarn traveling in a plane substantially parallel to the rapidly moving fluid.

7 Claims, 9 Drawing Figures PROCESS AND APPARATUS FOR INTERLACING STRANDS BACKGROUND OF THE INVENTION Various processes and devices have been proposed for the production of yarns having interlaced strands. Many of these proposals consist in subjecting the yarn, under light tension, moving between two yarn guides, to the action of at least one fluid flow, particularly a jet of compressed air. Generally, such jet of compressed air or other fluid is directed in a plane that is substantially perpendicular to the direction of movement of the yarn. In this way, the jet of air when impinging upon the yarn has the effect of interlacing the strands.

Generally, in the above type of process, the yarn is passed between a nozzle and a resonance box. In a specific form of this process, the fluid jet of compressed air, for example, is recovered at the outlet of the resonance box so as to make the fluid jet again act against the yarn so as to produce a further interlacement of the same. However, such a process has an additional difficulty and disadvantage associated therewith in that it is difficult to position the yarn which is subjected to the double effect of the fluid jet causing both translational and vibratory movement. Accordingly, control in such case is difficult and critical to effectively carry out the interlacement of the yarn.

In another conventional process, the yarn which is to be interlaced is placed in a zone of controlled turbulence, the axes of rotation being substantially parallel to the direction of advancement of the yarn. Utilizing such zone of controlled turbulence to effect the interlacement of the yarn, the action of the fluid jet is not pinpointed and the device used in such process generally comprises a conduit for passage of the yarn into which the delivery conduit or conduit for the fluid opens, generally in a plane substantially perpendicular to the direction of advancement of the yarn. It has been found that with conduits of the above type for passage of the yarn, the yarn has a tendency to be temporarily separated from its normal path. Because of this rather definite separation of the yarn from its normal path, irregularities result and in fact a lack of interlacement occurs in some cases. While conduits of special crosssection have been proposed for the passage of the yarn in order to obviate the foregoing disadvantage, such special configurations have not been found industrially satisfactory since they add further complications to the system and, therefore, make the process difficult to carry out on an industrial scale.

SUMMARY OF THE INVENTION The foregoing disadvantages of previous processes and devices for carrying out such processes have been overcome in accordance with the present invention whereby a process and device are provided for interlacing parallel strands of yarn, particularly adapted for interlacing such strands at high speeds. The process of the present invention has the advantage of being selfre'gulating, the same generally comprising subjecting the strands, while in motion and while substantially parallel, to the action of a rapidly moving fluid, which fluid is in the form of at least two fluid jets moving in a plane substantially parallel to the direction of movement of the strands, at least two of the jets impinging the yarn from opposite directions.

The device for carrying out such process for the production of yarns having interlaced strands comprises a first plate and a second plate having a surface in abutting relation with a surface of the first plate, the

first and second plates defining a passage for movement of the yarn therebetween. Such abutting surfaces of the first and second plates are characterized in that at least one of the same has recesses therein for passage of a rapidly moving fluid. In accordance with one embodiment of the present invention, the recesses are in only one of the abutting surfaces of the first and second plates, while in another embodiment, the recesses are formedin both abutting surfaces.

In the device of the present invention, at least two conduits are defined by the recesses in one or both of the abutting surfaces of the first and second plates. The conduits, in accordance with the present invention, can

be either curved or straight. Preferably, the conduits are curved so as to allow the rapidly moving fluid passing therethrough to impinge the yarn in a substantially tangential manner. The conduits formed by the recesses in one or both of the abutting surfaces of the first and second plates have a portion in common with the passage for movement of the yarn so as to deliver the rapidly moving fluid in a plane substantially parallel to the movement of the yarn. Means are provided to supply the rapidly moving fluid. to the conduits, the rapidly moving fluid being supplied by the conduits being so arranged that at least two of the conduits supply jets of the rapidly moving fluid to impinge the yarn from opposite directions.

In accordance with still further embodiments of the present invention, auxiliary jets can be provided to supply still further rapidly moving fluid and the conduits for supply of the rapidly moving fluid can be staggered. It is noted, however, that in each of these embodiments, the device and process are characterized by the fact that the rapidly moving fluid impinges the yarn in a plane substantially parallel to the movement of the yarn and at least two jets of rapidly moving fluid impinge the yarn from opposite directions. It is in this way that it is possible to produce an interlaced yarn under high speed operation.

Accordingly, it is a principal object of the present invention to provide a process and device for carrying out such process for the production of yarns with interlaced strands wherein such process and device eliminate the inherent deficiencies and disadvantages of prior art processes.

It is a further object of the present invention to provide such a process and device for the production of yarns with interlaced strands wherein a rapidly moving fluid impinges the yarn havingparallel strands from a plane substantially parallel to the movement of the yarn, the rapidly moving fluid being in the form of at least two jets impinging the yarn from opposite directions. 9

A still further object of the present invention comprises such device for the production of yarns with interlaced strands wherein such device includes at least two planes having abutting surfaces, the fluid impinging upon the yarn passing through at least two curved or straight conduits defined by recesses in such abutting surfaces and allowing the passage of the rapidly moving fluid in a plane substantially parallel to the movement of the yarn. 1

Still further objects and advantages of the novel process and device of the present invention will become more apparent from the following more detailed description thereof.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing objects and advantages of the present invention and the characteristic features thereof can be clearly seen in the accompanying drawings wherein:

FIG. 1 is a diagrammatic view illustrating a yarn drawing system utilizing the interlacing device of the present invention;

FIG. 2 is an exploded view in perspective of the interlacing device of the present invention;

FIG. 3 is an exploded view in perspective of a further embodiment of the interlacing device of the present invention;

FIG. 4 is a plan view of one plate of another embodiment of the interlacing device of the present invention;

FIG. 5 is a plan view of one plate of another embodiment of the interlacing device of the present invention;

FIG. 6 is a plan view of one plate of another embodiment of the interlacing device of the present invention;

FIG. 7 is a plan view of one plate of another embodiment of the interlacing device of the present invention;

FIG. 8 is a plan view of one plate of another embodiment of the interlacing device of the present invention; and

FIG. 9 is a plan view of one plate of another embodiment of the interlacing device of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 diagrammatically represents a drawing process wherein an interlacement device such as in accordance with the present invention is utilized. As seen in FIG. 1, a yarn 10 drawn from a spool 12 passes between a set of delivery rolls 14 and 16 and a set of draw rolls l8 and 20 on a pin 22, before passing through interlacing device 24 in which the strands of the yarn are interlaced by impingement with a rapidly moving fluid. After passing through interlacing device 24, the yarn, the strands of which have been interlaced, passes over roll 26 before being wound on a cop 28 by a device with a ring 30 and traveler 32.

A first embodiment of the interlacing device of the present invention is illustrated in FIG. 2. As seen in FIG. 2, interlacing device 24 consists of two blocks or plates, 40 and 42, in this case parallelepipedal blocks or plates. The first or upper plate 40 is held in abutting relation to the second or lower plate 42 by means of projections'or studs 44 and 46 which fit respectively into mating holes or apertures 48 and 50. As seen in FIG. 2, studs 44 and 46 project from the uppermost surface 52 of the second or lower plate 42, which surface 52 is in abutting relation to the lowermost surface 54 of the first plate or upper plate 40.

Associated with interlacing device 24 is a means for introducing a rapidly moving fluid, illustrated by inlet and delivery pipe 56. The rapidly moving fluid, preferably compressed air, is introduced through inlet pipe 56 into two branches 60 and 62 of conduits ending in two curved conduits 64 and 66, preferably of a smaller cross-section than branches 60 and 62.

It is noted that in the device of FIG. 2, conduits 64 and 66 open into a further conduit 68 for passage of the yarn. It will be noted that the plane of conduits 64 and 66 is substantially parallel to the plane of conduit 68. Accordingly, the rapidly moving fluid passing through conduits 64 and 66 impinges the yarn traveling through conduit 68 in a plane substantially parallel to the travel of the yarn 10. It will be noted by reference to FIG. 2 that conduits 64 and 66 and conduit 68 are so arranged that the rapidly moving fluid passing through conduit 64 and 66 inpinges upon yarn 10 in a substantially tangential manner. Again, it is noted that conduits 64 and 66 open into conduit 68 and have a portion in common therewith.

Projections 44 and 46 are so placed in conduits 64 and 66 as to obstruct the same, thus preventing any recycling of the rapidly moving fluid. Accordingly, the rapidly moving fluid exits the interlacing device of the present invention through hall or port 70 through conduit 72 connected to conduits 64 and 66.

The conduits of FIG. 2 have been shown as circular. It is to be noted, however, that such conduits can be in any curved or straight configuration which allows the rapidly moving fluid to impinge the yarn from opposite directions and in a plane substantially parallel to movement of the yarn. When utilizing curved conduits, it is preferred that the same are circular since such shape can be easily machined.

Additionally, it should be noted that recesses in the bottom plate 42 are preferably rectangular in crosssection. However, here again, any other suitable shape can be advantageously utilized. Similarly, while it has been shown in FIG. 2 that the recesses are entirely within the bottom plate, the recesses forming the conduits for passage of the rapidly moving fluid and yarn can be formed in both the upper plate 40 and bottom plate 42. Such embodiment is seen in FIG. 3.

Referring to FIG. 3, it is again noted that the rapidly moving fluid is introduced into the interlacing device through delivery conduit 56. Again, the rapidly moving fluid entering the interlacing device or nozzle separates into two branches, in this case, branches 60a and 62a, in the bottom plate 42 and branches 60b and 62b in the upper plate 40. The rapidly moving fluid is then passed into curved conduits, again found in the upper plate and lower plate. Curved conduits 64a and 66a of lower plate 42 and 64b and 66b of upper plate 40 again provide a smaller cross-section through which the rapidly moving fluid travels to impinge the yarn passing through a conduit formed by portions 68a and 68b of the bottom and top plates, respectively. Again, it can be seen that the curved conduits have a portion in common with the conduit through which the yarn passes, and the conduits are so arranged that jets of the rapidly moving fluid impinge the yarn from opposite directions. In addition, it can be seen in FIG. 3 that the plane of the rapidly moving fluid is substantially parallel to the plane of movement of the yarn. All other features of the embodiment of FIG. 3 are identical with those of FIG. 2 and are similarly numbered, the a and b designations indicating wherein the respective parts in FIG. 2 in the bottom plate are present in both plates of FIG. 3.

FIG. 4 illustrates an embodiment of the present invention wherein the curved conduits for delivery of the rapidly moving fluid have been moved to opposite sides of the interlacing device or nozzle. As seen in FIG. 2,

the rapidly moving fluid is introduced into the interlacing device or nozzle through delivery conduits 80 and 82, which delivery conduits end in curved conduits 84 and 86, which curved conduits are of smaller cross-section than the delivery conduits 80 and 82. As seen in FIG. 4, studs 44 and 46 obstruct curved conduits 84 and 86, respectively, preventing recycling of the rapidly moving fluid. Accordingly, the rapidly moving fluid after inpinging the yarn passing through conduit 88 exits through conduit or slit 90. As seen in the embodiment of FIG. 4, curved conduits 84 and 86 have portions in common with conduit 88 for passage of the yarn and the rapidly moving fluid passing through con- .duits 84 and 86 inpinges yarn 10 from opposite directions. Again, it is noted that the plane of the rapidly moving fluid is substantially parallel to the plane in which the yarn travels. 1

The device of FIG. 5 is similar to that of FIG. 4 except that those portions of the interlacing device or nozzle situated on the side opposite those portions having the curved conduit have been eliminated. Accordingly, the yarn moves freely between the portions of the interlacing device or nozzle having the curved conduits and the rapidly moving fluid after impinging yarn l0 escapes freely.

The device of FIG. 6 is similar to those of FIGS. 4 and 5, except that each of the portions of the interlacing device or nozzle now contains a curved conduit. Accordingly, the device of FIG. 6 shows four curved conduits serving to deliver the rapidly moving fluid to a zone in which the same impinges the yarn. As seen in FIG. 6, the rapidly moving fluid is introduced through delivery conduits 80, 82, 90 and 92. The delivery conduits 80, 82, 90 and 92 end in curved conduits 84, 86, 94 and 96, the curved conduits being of smaller crosssection than the delivery conduits. The curved conduits are obstructed by studs 44, 46, 98 and 100, preventing recycling of the rapidly moving fluid. Accordingly, after the fluid passing through the curved conduits impinges yarn l0 traveling through conduit 88, the fluid exits through conduit or slit 90. Here again, as in the case of the embodiments discussed previously, each of the curved conduits has a portion in common with the conduit through which the yarn travels and atleast two of the jets impinge the yarn in opposite directions. As seen in FIG. 6, there are two pairs of jets impinging the yarn from opposite directions.

Again, it is pointed out that FIGS. 2 through 6 each illustrate the employment of circular conduits. It is to be noted, however, that where the curved conduits are employed, the same need not be circular. Any other suitable configuration can be adapted to the interlacing device or nozzle of the present invention. In addition, straight conduits can be employed. This is illustrated in FIG. 7.

In the device of FIG. 7, the rapidly moving fluid is delivered through four oblique grooves or conduits 110. In FIG. 7, it can be seen that such oblique conduits 1 l0 deliver the rapidly moving fluid in contact with the yarn l0 traveling through conduit 112. The rapidly moving fluid delivery conduits 110 form two pairs of jets which impinge the yarn from opposite directions.

The rapidly moving fluid exits from the interlacing device or nozzle through conduit or slit 1 14. When employing straight conduits, as seen in FIG. 7, it is preferred that the same are oblique and form a small angle with regard to the yarn. Accordingly, the manner of impingement of the rapidly moving fluid using such straight conduits is similar to the tangential impingement obtained by the use of the curved or circularconduits, as seen in FIGS. 2 through 6. The precise angle which is chosen can be easily selected depending upon the effect desired, type of yarn, etc.

The device of FIG. 8 is similar to that of FIG. 7 except that the straight conduits have been replaced by semi-circular, curved conduits 116 and 118. As seen in FIG. 8, the rapidly moving fluid is introduced from both ends of the semi-circular, curved conduits so that each semi-circular conduit presents two jets moving in opposite directions and a portion in common with conduit 120 through which yarn 10 travels. In addition, FIG. 8 shows the employment of two auxiliary jets in the form of oblique conduits 127. and 124. Here again, the oblique conduits open to a common portion with conduit 120 through which yarn 10 travels. Again, the path of the rapidly moving fluid through both the curved and oblique conduits is in a plane substantially parallel to the plane of movement of the yarn. The rapidly moving fluid exits the interlacing device or nozzle of FIG. 8 through conduit or slit 126.

Lastly, the device of FIG. 9 illustrates the use of four semi-circular, curved conduits 1228 for delivery of the rapidly moving fluid. Each of the curved conduits has a portion in common with conduit through which yarn 10 travels. As seen in FIG. 9, curved conduits 128 are arranged so that a common portion exists for each of the curved conduits 128 and conduit 130. As seen in FIG. 9, each of the curved conduits delivers a jet of rapidly moving fluid to impinge the yarn l0 tangentially, at least two of the jets being in opposite directions. The rapidly moving fluid is introduced through only one end of the curved conduits and exits via the other.

In all of the embodiments shown in FIGS. 2 through 9, the plane of the rapidly moving fluid is substantially parallel to the plane of the moving yarn. In addition, each of the embodiments is characterized in that at least two jets of fluid are presented in opposite directions and the conduits for delivery of the fluid have a portion in common with the conduit through which the yarn passes. In this way, it is possible to effectively interlace a yarn having parallel strands, even at high speeds.

It is quite obvious that certain modifications of the embodiments of FIGS. 2 through 9 are within the scope of the present invention. For example, to obtain certain effects, it is often desirable to offset or stagger one of the conduits with respect to the other. In addition, while the foregoing description has been set forth primarily with regard to the employment of cold air as the rapidly moving fluid, it is quite obvious that a hot fluid such as steam can be employed where it is desired to obtain both interlacing and heat setting effects. Of course, other conventionally used fluids can be utilized in the interlacing device or nozzle of the present invention. i In accordance with preferred embodiments of the present invention, the angle made by the direction of the yarn passage with the direction of the jets is small, regardless of whether the conduits are straight. or

curved. With regard to the employment of curved or circular conduits, the direction of impingement of the jets of rapidly moving fluid with the yarn should be substantially tangential. In addition, as indicated previously, in order to increase the interlacing effect, or to obtain special effects on the yarn, more than two jets can be utilized, it being, of course, noted that at least two are in opposed directions. Auxiliary, oblique or radial jets may be utilized to obtain a better opening of the yarn in the interlacing zone. In addition, as indicated previously, it is also possible to use jets that are slightly staggered, although the jets are preferably disposed in the same plane. Similarly, it is possible to use jets that are slightly oblique, making a small angle with the direction of advancement of the yarn in order to promote opening of the same.

In order to obtain a still greater interlacing effect, it is possible to employ a plurality of interlacing devices or nozzles of the present invention in series.

By the process of the present invention, it is possible to interlace a yarn having parallel strands, imparting to it substantially the volume and the characteristics, i.e., cohesion, of a yarn with a true twist, the process of the present invention being characterized by unusual interlacing condition, particularly with regard to tension. In this regard, regardless of the yarn tension, the two jets being applied from opposite directions have a tendency to create a zone of relaxation of the yarn in the interlacing zone. Such process, therefore, has a self-regulating characteristic, which promotes the production of a regular yarn. Moreover, since the process of the present invention is not subject to the usual restraint associated with yarn tension, it is possible to readily apply the process of the present invention at high speeds.

The process of the present invention will now be illustrated by the following example:

EXAMPLE The device illustrated in FIG. 2 is utilized having the following characteristics: dimensions of plates 40 and 42, length 40 mm width 40 mm, height 8 mm. The slot or conduit for passage of the yarn has a square crosssection of 0.6 mm, while the fluid delivery conduits have a height of 0.8 mm and a width of 3 mm. The circular grooves have substantially rectangular cross-sections of 0.8 mm in height and 1 mm in width. The external diameter of the circular grooves or conduits is 14 mm with an interaxial difference of 14.4 mm.

Using the above device, a polyhexamethylene adipamide yarn, 78 dtex/23 strands, is treated under the following operating conditions: air pressure, 2.5 kg/cm measured in the delivery conduit; yarn tension, 8 g; rate of passage of the yarn, 700 m/min.

To measure the factor of cohesion of the yarn, a length of l m of the yarn is measured, vertically disposed, under a pretension of 0.18 g/dtex between two fixed points A and B. A hook is then introduced at a point equally distant between points A and B in the middle of the bundle formed by the elementary strands of the yarn so as to take only half of the strands. A traction force of 0.27 g/dtex is then exerted on the hook in a direction perpendicular to direction A-B, such traction force tending to separate the strands engaged in the hook from the strands not so engaged. This traction force is exerted by gravimetry by means of any yarn attached by an end to the hook and then passed over a free pulley so that the yarn remains in the plane perpendicular to A-B in the middle and by the other end to a weight which corresponds to the traction to be exerted. Under the effect of traction exerted on the strands engaged in the hook, the strands have a tendency to separate from the others, forming a triangle with A-B, but, due to the effect of retention of pseudo knots, the base of the triangle corresponds to a straight segment C-D smaller than AB. The cohesion factor can then be calculated from the difference A-B C-D.

By using the interlacing device of the present invention under the aforementioned conditions and the above means of calculating the cohesion factor, it is found that, in accordance with the present invention, a very good, reproducible cohesion factor is obtained with little scatter, a very important industrial characteristic of the interlacing device and process of the present invention. In this respect, the cohesion factor is measured as 67 cm with a slight scattering of values, substantially all of the values within 64 70 cm. In addition, as can be seen from the above example, the yarn tension is greater than tensions utilized in conventional interlacing processes, the tension being less critical in accordance with the present invention. In addition, the position near the yarn presents no difficulty in adjustment. Moreover, since the interlacing process of the present invention is self-regulating within certain limits of tension and pressure, the yarn that is obtained presents a regular interlacing effect, which is of great importance for subsequent applications.

While the present invention has been described primarily with regard to the foregoing illustration and exemplification, it should be understood that the present invention is in no way to be deemed as limited thereto but rather must be construed as broadly as all or any equivalents thereof.

What is claimed is:

1. A process for the production of a multistrand yarn having a coherent structure which comprises interlacing the strands by subjecting said strands, while moving and while substantially parallel to the action of a rapidly moving fluid, said fluid being in the form of at least two fluid jets moving in a plane substantially parallel to the direction of movement of said strands, at least two of said jets impinging said strands from opposite longitudinal directions in a substantially tangential manner.

2. The process of claim 1 wherein said yarn is additionally subjected to the action of rapidly moving fluid from auxiliary jets.

3. The process of claim 1 wherein said fluid jets are staggered with reference to each other.

4. A device for the production of a yarn having interlaced strands produced by impinging a rapidly moving fluid upon a moving yarn, including:

a. a first plate;

b. a second plate having a surface in abutting relation with surface of said first plate, said first and second plates defining a passage for movement of said yarn therebetween, at least one of the abutting surfaces of said first and second plates having recesses therein for passage of said rapidly moving fluid;

c. at least two curved conduits defined by said recess in at least one of said abutting surfaces of said first means to supply said rapidly moving fluid to said conduits, said means supplying said fluid to said conduits and said conduits being so arranged that at least two of said conduits supply jets of said rapidly moving fluid to impinge said yarn from opposite longitudinal directions in a substantially tangential manner. 5. The device of claim 4 further including auxiliary conduits for delivery of a rapidly moving fluid.

6. The device of claim 4 wherein said recesses are in only one of said abutting surfaces of said first and second plates.

7. The device of claim 4 wherein said recesses are in both of said abutting surfaces of said first and second plates. 

1. A process for the production of a multistrand yarn having a coherent structure which comprises interlacing the strands by subjecting said strands, while moving and while substantially parallel to the action of a rapidly moving fluid, said fluid being in the form of at least two fluid jets moving in a plane substantially parallel to the direction of movement of said strands, at least two of said jets impinging said strands from opposite longitudinal directions in a substantially tangential manner.
 2. The process of claim 1 wherein said yarn is additionally subjected to the action of rapidly moving fluid from auxiliary jets.
 3. The process of claim 1 wherein said fluid jets are staggered with reference to each other.
 4. A device for the production of a yarn having interlAced strands produced by impinging a rapidly moving fluid upon a moving yarn, including: a. a first plate; b. a second plate having a surface in abutting relation with surface of said first plate, said first and second plates defining a passage for movement of said yarn therebetween, at least one of the abutting surfaces of said first and second plates having recesses therein for passage of said rapidly moving fluid; c. at least two curved conduits defined by said recess in at least one of said abutting surfaces of said first and second plates, said conduits having a portion in common with said passage for movement of said yarn so as to deliver said rapidly moving fluid in a plane substantially parallel to the movement of said yarn; and d. means to supply said rapidly moving fluid to said conduits, said means supplying said fluid to said conduits and said conduits being so arranged that at least two of said conduits supply jets of said rapidly moving fluid to impinge said yarn from opposite longitudinal directions in a substantially tangential manner.
 5. The device of claim 4 further including auxiliary conduits for delivery of a rapidly moving fluid.
 6. The device of claim 4 wherein said recesses are in only one of said abutting surfaces of said first and second plates.
 7. The device of claim 4 wherein said recesses are in both of said abutting surfaces of said first and second plates. 